Crossword Genius

Trivial insult son dismissed (5)

Ross

I believe the answer is:

light

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'trivial' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

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(Other definitions for light that I've seen before include "weighing relatively little" , "Pane of glass" , "What smoker may be requesting" , "Illumination weights little" , "Opposite of dark" .)

I've seen this clue in The Independent.
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